; (function ($) {
    /*
        * ui.dropdownchecklist
        *
        * Copyright (c) 2008-2010 Adrian Tosca, Copyright (c) 2010-2011 Ittrium LLC
        * Dual licensed under the MIT (MIT-LICENSE.txt) OR GPL (GPL-LICENSE.txt) licenses.
        *
    */
    // The dropdown check list jQuery plugin transforms a regular select html element into a dropdown check list.
    $.widget("ui.dropdownchecklist", {
        // Some globlals
        // $.ui.dropdownchecklist.gLastOpened - keeps track of last opened dropdowncheck list so we can close it
        // $.ui.dropdownchecklist.gIDCounter - simple counter to provide a unique ID as needed
        version: function () {
            alert('DropDownCheckList v1.4');
        },
        // Creates the drop container that keeps the items and appends it to the document
        _appendDropContainer: function (controlItem) {
            var wrapper = $("<div/>");
            // the container is wrapped in a div
            wrapper.addClass("ui-dropdownchecklist ui-dropdownchecklist-dropcontainer-wrapper");
            wrapper.addClass("ui-widget");
            // assign an id
            wrapper.attr("id", controlItem.attr("id") + '-ddw');
            // initially positioned way off screen to prevent it from displaying
            // NOTE absolute position to enable width/height calculation
            wrapper.css({ position: 'absolute', left: "-33000px", top: "-33000px" });

            var container = $("<div/>"); // the actual container
            container.addClass("ui-dropdownchecklist-dropcontainer ui-widget-content");
            container.css("overflow-y", "auto");
            wrapper.append(container);

            // insert the dropdown after the master control to try to keep the tab order intact
            // if you just add it to the end, tabbing out of the drop down takes focus off the page
            // @todo 22Sept2010 - check if size calculation is thrown off if the parent of the
            //		selector is hidden.  We may need to add it to the end of the document here, 
            //		calculate the size, and then move it back into proper position???
            //$(document.body).append(wrapper);
            wrapper.insertAfter(controlItem);

            // flag that tells if the drop container is shown or not
            wrapper.isOpen = false;
            return wrapper;
        },
        // Look for browser standard 'open' on a closed selector
        _isDropDownKeyShortcut: function (e, keycode) {
            return e.altKey && ($.ui.keyCode.DOWN == keycode);// Alt + Down Arrow
        },
        // Look for key that will tell us to close the open dropdown
        _isDropDownCloseKey: function (e, keycode) {
            return ($.ui.keyCode.ESCAPE == keycode) || ($.ui.keyCode.ENTER == keycode);
        },
        // Handler to change the active focus based on a keystroke, moving some count of
        // items from the element that has the current focus
        _keyFocusChange: function (target, delta, limitToItems) {
            // Find item with current focus
            var focusables = $(":focusable");
            var index = focusables.index(target);
            if (index >= 0) {
                index += delta;
                if (limitToItems) {
                    // Bound change to list of input elements
                    var allCheckboxes = this.dropWrapper.find("input:not([disabled])");
                    var firstIndex = focusables.index(allCheckboxes.get(0));
                    var lastIndex = focusables.index(allCheckboxes.get(allCheckboxes.length - 1));
                    if (index < firstIndex) {
                        index = lastIndex;
                    } else if (index > lastIndex) {
                        index = firstIndex;
                    }
                }
                focusables.get(index).focus();
            }
        },
        // Look for navigation, open, close (wired to keyup)
        _handleKeyboard: function (e) {
            var self = this;
            var keyCode = (e.keyCode || e.which);
            if (!self.dropWrapper.isOpen && self._isDropDownKeyShortcut(e, keyCode)) {
                // Key command to open the dropdown
                e.stopImmediatePropagation();
                self._toggleDropContainer(true);
            } else if (self.dropWrapper.isOpen && self._isDropDownCloseKey(e, keyCode)) {
                // Key command to close the dropdown (but we retain focus in the control)
                e.stopImmediatePropagation();
                self._toggleDropContainer(false);
                self.controlSelector.focus();
            } else if (self.dropWrapper.isOpen
					&& (e.target.type == 'checkbox')
					&& ((keyCode == $.ui.keyCode.DOWN) || (keyCode == $.ui.keyCode.UP))) {
                // Up/Down to cycle throught the open items
                e.stopImmediatePropagation();
                self._keyFocusChange(e.target, (keyCode == $.ui.keyCode.DOWN) ? 1 : -1, true);
            } else if (self.dropWrapper.isOpen && (keyCode == $.ui.keyCode.TAB)) {
                // I wanted to adjust normal 'tab' processing here, but research indicates
                // that TAB key processing is NOT a cancelable event. You have to use a timer
                // hack to pull the focus back to where you want it after browser tab
                // processing completes.  Not going to work for us.
                //e.stopImmediatePropagation();
                //self._keyFocusChange(e.target, (e.shiftKey) ? -1 : 1, true);
            }
        },
        // Look for change of focus
        _handleFocus: function (e, focusIn, forDropdown) {
            var self = this;
            if (forDropdown && !self.dropWrapper.isOpen) {
                // if the focus changes when the control is NOT open, mark it to show where the focus is/is not
                e.stopImmediatePropagation();
                if (focusIn) {
                    self.controlSelector.addClass("ui-state-hover");
                    if ($.ui.dropdownchecklist.gLastOpened != null) {
                        $.ui.dropdownchecklist.gLastOpened._toggleDropContainer(false);
                    }
                } else {
                    self.controlSelector.removeClass("ui-state-hover");
                }
            } else if (!forDropdown && !focusIn) {
                // The dropdown is open, and an item (NOT the dropdown) has just lost the focus.
                // we really need a reliable method to see who has the focus as we process the blur,
                // but that mechanism does not seem to exist.  Instead we rely on a delay before
                // posting the blur, with a focus event cancelling it before the delay expires.
                if (e != null) { e.stopImmediatePropagation(); }
                self.controlSelector.removeClass("ui-state-hover");
                self._toggleDropContainer(false);
            }
        },
        // Clear the pending change of focus, which keeps us 'in' the control
        _cancelBlur: function (e) {
            var self = this;
            if (self.blurringItem != null) {
                clearTimeout(self.blurringItem);
                self.blurringItem = null;
            }
        },
        // Creates the control that will replace the source select and appends it to the document
        // The control resembles a regular select with single selection
        _appendControl: function () {
            var self = this, sourceSelect = this.sourceSelect, options = this.options;

            // the control is wrapped in a basic container
            // inline-block at this level seems to give us better size control
            var wrapper = $("<span/>");
            wrapper.addClass("ui-dropdownchecklist ui-dropdownchecklist-selector-wrapper ui-widget");
            wrapper.css({ display: "inline-block", cursor: "default", overflow: "hidden" });

            // assign an ID 
            var baseID = sourceSelect.attr("id");
            if ((baseID == null) || (baseID == "")) {
                baseID = "ddcl-" + $.ui.dropdownchecklist.gIDCounter++;
            } else {
                baseID = "ddcl-" + baseID;
            }
            wrapper.attr("id", baseID);

            // the actual control which you can style
            // inline-block needed to enable 'width' but has interesting problems cross browser
            var control = $("<span/>");
            control.addClass("ui-dropdownchecklist-selector ui-state-default");
            control.css({ display: "inline-block", overflow: "hidden", 'white-space': 'nowrap' });
            // Setting a tab index means we are interested in the tab sequence
            var tabIndex = sourceSelect.attr("tabIndex");
            if (tabIndex == null) {
                tabIndex = 0;
            } else {
                tabIndex = parseInt(tabIndex);
                if (tabIndex < 0) {
                    tabIndex = 0;
                }
            }
            control.attr("tabIndex", tabIndex);
            control.keyup(function (e) { self._handleKeyboard(e); });
            control.focus(function (e) { self._handleFocus(e, true, true); });
            control.blur(function (e) { self._handleFocus(e, false, true); });
            wrapper.append(control);

            // the optional icon (which is inherently a block) which we can float
            if (options.icon != null) {
                var iconPlacement = (options.icon.placement == null) ? "left" : options.icon.placement;
                var anIcon = $("<div/>");
                anIcon.addClass("ui-icon");
                anIcon.addClass((options.icon.toOpen != null) ? options.icon.toOpen : "ui-icon-triangle-1-e");
                anIcon.css({ 'float': iconPlacement });
                control.append(anIcon);
            }
            // the text container keeps the control text that is built from the selected (checked) items
            // inline-block needed to prevent long text from wrapping to next line when icon is active
            var textContainer = $("<span/>");
            textContainer.addClass("ui-dropdownchecklist-text");
            textContainer.css({ display: "inline-block", 'white-space': "nowrap", overflow: "hidden" });
            control.append(textContainer);

            // add the hover styles to the control
            wrapper.hover(
	            function () {
	                if (!self.disabled) {
	                    control.addClass("ui-state-hover");
	                }
	            }
	        , function () {
	            if (!self.disabled) {
	                control.removeClass("ui-state-hover");
	            }
	        }
	        );
            // clicking on the control toggles the drop container
            wrapper.click(function (event) {
                if (!self.disabled) {
                    event.stopImmediatePropagation();
                    self._toggleDropContainer(!self.dropWrapper.isOpen);
                }
            });
            wrapper.insertAfter(sourceSelect);

            // Watch for a window resize and adjust the control if open
            $(window).resize(function () {
                if (!self.disabled && self.dropWrapper.isOpen) {
                    // Reopen yourself to get the position right
                    self._toggleDropContainer(true);
                }
            });
            return wrapper;
        },
        // Creates a drop item that coresponds to an option element in the source select
        _createDropItem: function (index, tabIndex, value, text, optCss, checked, disabled, indent) {
            var self = this, options = this.options, sourceSelect = this.sourceSelect, controlWrapper = this.controlWrapper;
            // the item contains a div that contains a checkbox input and a lable for the text
            // the div
            var item = $("<div/>");
            item.addClass("ui-dropdownchecklist-item");
            item.css({ 'white-space': "nowrap" });
            var checkedString = checked ? ' checked="checked"' : '';
            var classString = disabled ? ' class="inactive"' : ' class="active"';

            // generated id must be a bit unique to keep from colliding
            var idBase = controlWrapper.attr("id");
            var id = idBase + '-i' + index;
            var checkBox;

            // all items start out disabled to keep them out of the tab order
            if (self.isMultiple) { // the checkbox
                checkBox = $('<input disabled type="checkbox" id="' + id + '"' + checkedString + classString + ' tabindex="' + tabIndex + '" />');
            } else { // the radiobutton
                checkBox = $('<input disabled type="radio" id="' + id + '" name="' + idBase + '"' + checkedString + classString + ' tabindex="' + tabIndex + '" />');
            }
            checkBox = checkBox.attr("index", index).val(value);
            item.append(checkBox);

            // the text
            var label = $("<label for=" + id + "/>");
            label.addClass("ui-dropdownchecklist-text");
            if (optCss != null) label.attr('style', optCss);
            label.css({ cursor: "default" });
            label.html(text);
            if (indent) {
                item.addClass("ui-dropdownchecklist-indent");
            }
            item.addClass("ui-state-default");
            if (disabled) {
                item.addClass("ui-state-disabled");
            }
            label.click(function (e) { e.stopImmediatePropagation(); });
            item.append(label);

            // active items display themselves with hover
            item.hover(
            	function (e) {
            	    var anItem = $(this);
            	    if (!anItem.hasClass("ui-state-disabled")) { anItem.addClass("ui-state-hover"); }
            	}
            , function (e) {
                var anItem = $(this);
                anItem.removeClass("ui-state-hover");
            }
            );
            // clicking on the checkbox synchronizes the source select
            checkBox.click(function (e) {
                var aCheckBox = $(this);
                e.stopImmediatePropagation();
                if (aCheckBox.hasClass("active")) {
                    // Active checkboxes take active action
                    var callback = self.options.onItemClick;
                    if ($.isFunction(callback)) try {
                        callback.call(self, aCheckBox, sourceSelect.get(0));
                    } catch (ex) {
                        // reject the change on any error
                        aCheckBox.prop("checked", !aCheckBox.prop("checked"));
                        self._syncSelected(aCheckBox);
                        return;
                    }
                    self._syncSelected(aCheckBox);
                    self.sourceSelect.trigger("change", 'ddcl_internal');
                    if (!self.isMultiple && options.closeRadioOnClick) {
                        self._toggleDropContainer(false);
                    }
                }
            });
            // we are interested in the focus leaving the check box
            // but we need to detect the focus leaving one check box but
            // entering another. There is no reliable way to detect who
            // received the focus on a blur, so post the blur in the future,
            // knowing we will cancel it if we capture the focus in a timely manner
            // 23Sept2010 - unfortunately, IE 7+ and Chrome like to post a blur
            // 				event to the current item with focus when the user
            //				clicks in the scroll bar. So if you have a scrollable
            //				dropdown with focus on an item, clicking in the scroll
            //				will close the drop down.
            //				I have no solution for blur processing at this time.
            /*********
                        var timerFunction = function(){ 
                            // I had a hell of a time getting setTimeout to fire this, do not try to
                            // define it within the blur function
                            try { self._handleFocus(null,false,false); } catch(ex){ alert('timer failed: '+ex);}
                        };
                        checkBox.blur(function(e) { 
                            self.blurringItem = setTimeout( timerFunction, 200 ); 
                        });
                        checkBox.focus(function(e) {self._cancelBlur();});
            **********/
            // check/uncheck the item on clicks on the entire item div
            item.click(function (e) {
                var anItem = $(this);
                e.stopImmediatePropagation();
                if (!anItem.hasClass("ui-state-disabled")) {
                    // check/uncheck the underlying control
                    var aCheckBox = anItem.find("input");
                    var checked = aCheckBox.prop("checked");
                    aCheckBox.prop("checked", !checked);

                    var callback = self.options.onItemClick;
                    if ($.isFunction(callback)) try {
                        callback.call(self, aCheckBox, sourceSelect.get(0));
                    } catch (ex) {
                        // reject the change on any error
                        aCheckBox.prop("checked", checked);
                        self._syncSelected(aCheckBox);
                        return;
                    }
                    self._syncSelected(aCheckBox);
                    self.sourceSelect.trigger("change", 'ddcl_internal');
                    if (!checked && !self.isMultiple && options.closeRadioOnClick) {
                        self._toggleDropContainer(false);
                    }
                } else {
                    // retain the focus even if disabled
                    anItem.focus();
                    self._cancelBlur();
                }
            });
            // do not let the focus wander around
            item.focus(function (e) {
                var anItem = $(this);
                e.stopImmediatePropagation();
            });
            item.keyup(function (e) { self._handleKeyboard(e); });
            return item;
        },
        _createGroupItem: function (text, disabled) {
            var self = this;
            var group = $("<div />");
            group.addClass("ui-dropdownchecklist-group ui-widget-header");
            if (disabled) {
                group.addClass("ui-state-disabled");
            }
            group.css({ 'white-space': "nowrap" });

            var label = $("<span/>");
            label.addClass("ui-dropdownchecklist-text");
            label.css({ cursor: "default" });
            label.text(text);
            group.append(label);

            // anything interesting when you click the group???
            group.click(function (e) {
                var aGroup = $(this);
                e.stopImmediatePropagation();
                // retain the focus even if no action is taken
                aGroup.focus();
                self._cancelBlur();
            });
            // do not let the focus wander around
            group.focus(function (e) {
                var aGroup = $(this);
                e.stopImmediatePropagation();
            });
            return group;
        },
        _createCloseItem: function (text) {
            var self = this;
            var closeItem = $("<div />");
            closeItem.addClass("ui-state-default ui-dropdownchecklist-close ui-dropdownchecklist-item");
            closeItem.css({ 'white-space': 'nowrap', 'text-align': 'right' });

            var label = $("<span/>");
            label.addClass("ui-dropdownchecklist-text");
            label.css({ cursor: "default" });
            label.html(text);
            closeItem.append(label);

            // close the control on click
            closeItem.click(function (e) {
                var aGroup = $(this);
                e.stopImmediatePropagation();
                // retain the focus even if no action is taken
                aGroup.focus();
                self._toggleDropContainer(false);
            });
            closeItem.hover(
            	function (e) { $(this).addClass("ui-state-hover"); }
            , function (e) { $(this).removeClass("ui-state-hover"); }
            );
            // do not let the focus wander around
            closeItem.focus(function (e) {
                var aGroup = $(this);
                e.stopImmediatePropagation();
            });
            return closeItem;
        },
        // Creates the drop items and appends them to the drop container
        // Also calculates the size needed by the drop container and returns it
        _appendItems: function () {
            var self = this, config = this.options, sourceSelect = this.sourceSelect, dropWrapper = this.dropWrapper;
            var dropContainerDiv = dropWrapper.find(".ui-dropdownchecklist-dropcontainer");
            
            sourceSelect.children().each(function (index) { // when the select has groups
                var opt = $(this);
                if (opt.is("option")) {
                    self._appendOption(opt, dropContainerDiv, index, false, false);
                } else if (opt.is("optgroup")) {
                    var disabled = opt.prop("disabled");
                    var text = opt.attr("label");
                    if (text != "") {
                        var group = self._createGroupItem(text, disabled);
                        dropContainerDiv.append(group);
                    }
                    self._appendOptions(opt, dropContainerDiv, index, true, disabled);
                }
            });
            if (config.explicitClose != null) {
                var closeItem = self._createCloseItem(config.explicitClose);
                dropContainerDiv.append(closeItem);
            }
            var divWidth = dropContainerDiv.outerWidth();
            var divHeight = dropContainerDiv.outerHeight();
            return { width: divWidth, height: divHeight };
        },
        _appendOptions: function (parent, container, parentIndex, indent, forceDisabled) {
            var self = this;
            parent.children("option").each(function (index) {
                var option = $(this);
                var childIndex = (parentIndex + "." + index);
                self._appendOption(option, container, childIndex, indent, forceDisabled);
            });
        },
        _appendOption: function (option, container, index, indent, forceDisabled) {
            var self = this;
            // Note that the browsers destroy any html structure within the OPTION
            var text = option.html();
            if ((text != null) && (text != '')) {
                var value = option.val();
                var optCss = option.attr('style');
                var selected = option.prop("selected");
                var disabled = (forceDisabled || option.prop("disabled"));
                // Use the same tab index as the selector replacement
                var tabIndex = self.controlSelector.attr("tabindex");
                var item = self._createDropItem(index, tabIndex, value, text, optCss, selected, disabled, indent);
                container.append(item);
            }
        },
        // Synchronizes the items checked and the source select
        // When firstItemChecksAll option is active also synchronizes the checked items
        // senderCheckbox parameters is the checkbox input that generated the synchronization
        _syncSelected: function (senderCheckbox) {
            var self = this, options = this.options, sourceSelect = this.sourceSelect, dropWrapper = this.dropWrapper;
            var selectOptions = sourceSelect.get(0).options;
            var allCheckboxes = dropWrapper.find("input.active");
            if (options.firstItemChecksAll == 'exclusive') {
                if ((senderCheckbox == null) && $(selectOptions[0]).prop("selected")) {
                    // Initialization call with first item active
                    allCheckboxes.prop("checked", false);
                    $(allCheckboxes[0]).prop("checked", true);
                } else if ((senderCheckbox != null) && (senderCheckbox.attr("index") == 0)) {
                    // Action on the first, so all other checkboxes NOT active
                    var firstIsActive = senderCheckbox.prop("checked");
                    allCheckboxes.prop("checked", false);
                    $(allCheckboxes[0]).prop("checked", firstIsActive);
                } else {
                    // check the first checkbox if all the other checkboxes are checked
                    var allChecked = true;
                    var firstCheckbox = null;
                    allCheckboxes.each(function (index) {
                        if (index > 0) {
                            var checked = $(this).prop("checked");
                            if (!checked) { allChecked = false; }
                        } else {
                            firstCheckbox = $(this);
                        }
                    });
                    if (firstCheckbox != null) {
                        if (allChecked) {
                            // when all are checked, only the first left checked
                            allCheckboxes.prop("checked", false);
                        }
                        firstCheckbox.prop("checked", allChecked);
                    }
                }
            } else if (options.firstItemChecksAll) {
                if ((senderCheckbox == null) && $(selectOptions[0]).prop("selected")) {
                    // Initialization call with first item active so force all to be active
                    allCheckboxes.prop("checked", true);
                } else if ((senderCheckbox != null) && (senderCheckbox.attr("index") == 0)) {
                    // Check all checkboxes if the first one is checked
                    allCheckboxes.prop("checked", senderCheckbox.prop("checked"));
                } else {
                    // check the first checkbox if all the other checkboxes are checked
                    var allChecked = true;
                    var firstCheckbox = null;
                    allCheckboxes.each(function (index) {
                        if (index > 0) {
                            var checked = $(this).prop("checked");
                            if (!checked) { allChecked = false; }
                        } else {
                            firstCheckbox = $(this);
                        }
                    });
                    if (firstCheckbox != null) {
                        firstCheckbox.prop("checked", allChecked);
                    }
                }
            }
            // do the actual synch with the source select
            var empties = 0;
            allCheckboxes = dropWrapper.find("input");
            allCheckboxes.each(function (index) {
                var anOption = $(selectOptions[index + empties]);
                var optionText = anOption.html();
                if ((optionText == null) || (optionText == '')) {
                    empties += 1;
                    anOption = $(selectOptions[index + empties]);
                }
                anOption.prop("selected", $(this).prop("checked"));
            });
            // update the text shown in the control
            self._updateControlText();

            // Ensure the focus stays pointing where the user is working
            if (senderCheckbox != null) { senderCheckbox.focus(); }
        },
        _sourceSelectChangeHandler: function (event) {
            var self = this, dropWrapper = this.dropWrapper;
            dropWrapper.find("input").val(self.sourceSelect.val());

            // update the text shown in the control
            self._updateControlText();
        },
        // Updates the text shown in the control depending on the checked (selected) items
        _updateControlText: function () {
            var self = this, sourceSelect = this.sourceSelect, options = this.options, controlWrapper = this.controlWrapper;
            var firstOption = sourceSelect.find("option:first");
            var selectOptions = sourceSelect.find("option");
            var text = self._formatText(selectOptions, options.firstItemChecksAll, firstOption);
            var controlLabel = controlWrapper.find(".ui-dropdownchecklist-text");
            controlLabel.html(text);
            // the attribute needs naked text, not html
            controlLabel.attr("title", controlLabel.text());
        },
        // Formats the text that is shown in the control
        _formatText: function (selectOptions, firstItemChecksAll, firstOption) {
            var text;
            if ($.isFunction(this.options.textFormatFunction)) {
                // let the callback do the formatting, but do not allow it to fail
                try {
                    text = this.options.textFormatFunction(selectOptions);
                } catch (ex) {
                    alert('textFormatFunction failed: ' + ex);
                }
            } else if (firstItemChecksAll && (firstOption != null) && firstOption.prop("selected")) {
                // just set the text from the first item
                text = firstOption.html();
            } else {
                // concatenate the text from the checked items
                text = "";
                selectOptions.each(function () {
                    if ($(this).prop("selected")) {
                        if (text != "") { text += ", "; }
                        /* NOTE use of .html versus .text, which can screw up ampersands for IE */
                        var optCss = $(this).attr('style');
                        var tempspan = $('<span/>');
                        tempspan.html($(this).html());
                        if (optCss == null) {
                            text += tempspan.html();
                        } else {
                            tempspan.attr('style', optCss);
                            text += $("<span/>").append(tempspan).html();
                        }
                    }
                });
                if (text == "") {
                    text = (this.options.emptyText != null) ? this.options.emptyText : "&nbsp;";
                }
            }
            return text;
        },
        // Shows and hides the drop container
        _toggleDropContainer: function (makeOpen) {
            var self = this;
            // hides the last shown drop container
            var hide = function (instance) {
                if ((instance != null) && instance.dropWrapper.isOpen) {
                    instance.dropWrapper.isOpen = false;
                    $.ui.dropdownchecklist.gLastOpened = null;

                    var config = instance.options;
                    instance.dropWrapper.css({
                        top: "-33000px",
                        left: "-33000px"
                    });
                    var aControl = instance.controlSelector;
                    aControl.removeClass("ui-state-active");
                    aControl.removeClass("ui-state-hover");

                    var anIcon = instance.controlWrapper.find(".ui-icon");
                    if (anIcon.length > 0) {
                        anIcon.removeClass((config.icon.toClose != null) ? config.icon.toClose : "ui-icon-triangle-1-s");
                        anIcon.addClass((config.icon.toOpen != null) ? config.icon.toOpen : "ui-icon-triangle-1-e");
                    }
                    $(document).unbind("click", hide);

                    // keep the items out of the tab order by disabling them
                    instance.dropWrapper.find("input.active").prop("disabled", true);

                    // the following blur just does not fire???  because it is hidden???  because it does not have focus???
                    //instance.sourceSelect.trigger("blur");
                    //instance.sourceSelect.triggerHandler("blur");
                    if ($.isFunction(config.onComplete)) {
                        try {
                            config.onComplete.call(instance, instance.sourceSelect.get(0));
                        } catch (ex) {
                            alert('callback failed: ' + ex);
                        }
                    }
                }
            };
            // shows the given drop container instance
            var show = function (instance) {
                if (!instance.dropWrapper.isOpen) {
                    instance.dropWrapper.isOpen = true;
                    $.ui.dropdownchecklist.gLastOpened = instance;

                    var config = instance.options;
                    /**** Issue127 (and the like) to correct positioning when parent element is relative
                     ****	This positioning only worked with simple, non-relative parent position
                                        instance.dropWrapper.css({
                                            top: instance.controlWrapper.offset().top + instance.controlWrapper.outerHeight() + "px",
                                            left: instance.controlWrapper.offset().left + "px"
                                        });
                    ****/
                    if ((config.positionHow == null) || (config.positionHow == 'absolute')) {
                        /** Floats above subsequent content, but does NOT scroll */
                        instance.dropWrapper.css({
                            position: 'absolute'
		                , top: instance.controlWrapper.position().top + instance.controlWrapper.outerHeight() + "px"
		                , left: instance.controlWrapper.position().left + "px"
                        });
                    } else if (config.positionHow == 'relative') {
                        /** Scrolls with the parent but does NOT float above subsequent content */
                        instance.dropWrapper.css({
                            position: 'relative'
		                , top: "0px"
		                , left: "0px"
                        });
                    }
                    var zIndex = 0;
                    if (config.zIndex == null) {
                        var ancestorsZIndexes = instance.controlWrapper.parents().map(
							function () {
							    var zIndex = $(this).css("z-index");
							    return isNaN(zIndex) ? 0 : zIndex;
							}
							).get();
                        var parentZIndex = Math.max.apply(Math, ancestorsZIndexes);
                        if (parentZIndex >= 0) zIndex = parentZIndex + 1;
                    } else {
                        /* Explicit set from the optins */
                        zIndex = parseInt(config.zIndex);
                    }
                    if (zIndex > 0) {
                        instance.dropWrapper.css({ 'z-index': zIndex });
                    }

                    var aControl = instance.controlSelector;
                    aControl.addClass("ui-state-active");
                    aControl.removeClass("ui-state-hover");

                    var anIcon = instance.controlWrapper.find(".ui-icon");
                    if (anIcon.length > 0) {
                        anIcon.removeClass((config.icon.toOpen != null) ? config.icon.toOpen : "ui-icon-triangle-1-e");
                        anIcon.addClass((config.icon.toClose != null) ? config.icon.toClose : "ui-icon-triangle-1-s");
                    }
                    $(document).bind("click", function (e) { hide(instance); });

                    // insert the items back into the tab order by enabling all active ones
                    var activeItems = instance.dropWrapper.find("input.active");
                    activeItems.prop("disabled", false);

                    // we want the focus on the first active input item
                    var firstActiveItem = activeItems.get(0);
                    if (firstActiveItem != null) {
                        firstActiveItem.focus();
                    }
                }
            };
            if (makeOpen) {
                hide($.ui.dropdownchecklist.gLastOpened);
                show(self);
            } else {
                hide(self);
            }
        },
        // Set the size of the control and of the drop container
        _setSize: function (dropCalculatedSize) {
            var options = this.options, dropWrapper = this.dropWrapper, controlWrapper = this.controlWrapper;

            // use the width from config options if set, otherwise set the same width as the drop container
            var controlWidth = dropCalculatedSize.width;
            if (options.width != null) {
                controlWidth = parseInt(options.width)-1;
            } else if (options.minWidth != null) {
                var minWidth = parseInt(options.minWidth);
                // if the width is too small (usually when there are no items) set a minimum width
                if (controlWidth < minWidth) {
                    controlWidth = minWidth;
                }
            }
            var control = this.controlSelector;
            control.css({ width: controlWidth + "px" });

            // if we size the text, then Firefox places icons to the right properly
            // and we do not wrap on long lines
            var controlText = control.find(".ui-dropdownchecklist-text");
            var controlIcon = control.find(".ui-icon");
            if (controlIcon != null) {
                // Must be an inner/outer/border problem, but IE6 needs an extra bit of space,
                // otherwise you can get text pushed down into a second line when icons are active
                controlWidth -= (controlIcon.outerWidth() + 20);
                controlText.css({ width: controlWidth + "px" });
            }
            // Account for padding, borders, etc
            controlWidth = controlWrapper.outerWidth();

            // the drop container height can be set from options
            var maxDropHeight = (options.maxDropHeight != null)
            					? parseInt(options.maxDropHeight)
            					: -1;
            var dropHeight = ((maxDropHeight > 0) && (dropCalculatedSize.height > maxDropHeight))
            					? maxDropHeight
            					: dropCalculatedSize.height;
            // ensure the drop container is not less than the control width (would be ugly)
            var dropWidth = dropCalculatedSize.width < controlWidth ? controlWidth : dropCalculatedSize.width;

            $(dropWrapper).css({
                height: dropHeight + "px",
                width: dropWidth + "px"
            });
            dropWrapper.find(".ui-dropdownchecklist-dropcontainer").css({
                height: dropHeight + "px"
            });
        },
        // Initializes the plugin
        _init: function () {
            var self = this, options = this.options;
            if ($.ui.dropdownchecklist.gIDCounter == null) {
                $.ui.dropdownchecklist.gIDCounter = 1;
            }
            // item blurring relies on a cancelable timer
            self.blurringItem = null;

            // sourceSelect is the select on which the plugin is applied
            var sourceSelect = self.element;
            self.initialDisplay = sourceSelect.css("display");
            sourceSelect.css("display", "none");
            self.initialMultiple = sourceSelect.prop("multiple");
            self.isMultiple = self.initialMultiple;
            if (options.forceMultiple != null) { self.isMultiple = options.forceMultiple; }
            sourceSelect.prop("multiple", true);
            self.sourceSelect = sourceSelect;

            // append the control that resembles a single selection select
            var controlWrapper = self._appendControl();
            self.controlWrapper = controlWrapper;
            self.controlSelector = controlWrapper.find(".ui-dropdownchecklist-selector");

            // create the drop container where the items are shown
            var dropWrapper = self._appendDropContainer(controlWrapper);
            self.dropWrapper = dropWrapper;

            // append the items from the source select element
            var dropCalculatedSize = self._appendItems();

            // updates the text shown in the control
            self._updateControlText(controlWrapper, dropWrapper, sourceSelect);

            // set the sizes of control and drop container
            self._setSize(dropCalculatedSize);

            // look for possible auto-check needed on first item
            if (options.firstItemChecksAll) {
                self._syncSelected(null);
            }
            // BGIFrame for IE6
            if (options.bgiframe && typeof self.dropWrapper.bgiframe == "function") {
                self.dropWrapper.bgiframe();
            }
            // listen for change events on the source select element
            // ensure we avoid processing internally triggered changes
            self.sourceSelect.change(function (event, eventName) {
                if (eventName != 'ddcl_internal') {
                    self._sourceSelectChangeHandler(event);
                }
            });
        },
        // Refresh the disable and check state from the underlying control
        _refreshOption: function (item, disabled, selected) {
            var aParent = item.parent();
            // account for enabled/disabled
            if (disabled) {
                item.prop("disabled", true);
                item.removeClass("active");
                item.addClass("inactive");
                aParent.addClass("ui-state-disabled");
            } else {
                item.prop("disabled", false);
                item.removeClass("inactive");
                item.addClass("active");
                aParent.removeClass("ui-state-disabled");
            }
            // adjust the checkbox state
            item.prop("checked", selected);
        },
        _refreshGroup: function (group, disabled) {
            if (disabled) {
                group.addClass("ui-state-disabled");
            } else {
                group.removeClass("ui-state-disabled");
            }
        },
        // External command to explicitly close the dropdown
        close: function () {
            this._toggleDropContainer(false);
        },
        // External command to refresh the ddcl from the underlying selector
        refresh: function () {
            var self = this, sourceSelect = this.sourceSelect, dropWrapper = this.dropWrapper;

            var allCheckBoxes = dropWrapper.find("input");
            var allGroups = dropWrapper.find(".ui-dropdownchecklist-group");

            var groupCount = 0;
            var optionCount = 0;
            sourceSelect.children().each(function (index) {
                var opt = $(this);
                var disabled = opt.prop("disabled");
                if (opt.is("option")) {
                    var selected = opt.prop("selected");
                    var anItem = $(allCheckBoxes[optionCount]);
                    self._refreshOption(anItem, disabled, selected);
                    optionCount += 1;
                } else if (opt.is("optgroup")) {
                    var text = opt.attr("label");
                    if (text != "") {
                        var aGroup = $(allGroups[groupCount]);
                        self._refreshGroup(aGroup, disabled);
                        groupCount += 1;
                    }
                    opt.children("option").each(function () {
                        var subopt = $(this);
                        var subdisabled = (disabled || subopt.prop("disabled"));
                        var selected = subopt.prop("selected");
                        var subItem = $(allCheckBoxes[optionCount]);
                        self._refreshOption(subItem, subdisabled, selected);
                        optionCount += 1;
                    });
                }
            });
            // sync will handle firstItemChecksAll and updateControlText
            self._syncSelected(null);
        },
        // External command to enable the ddcl control
        enable: function () {
            this.controlSelector.removeClass("ui-state-disabled");
            this.disabled = false;
        },
        // External command to disable the ddcl control
        disable: function () {
            this.controlSelector.addClass("ui-state-disabled");
            this.disabled = true;
        },
        // External command to destroy all traces of the ddcl control
        destroy: function () {
            $.Widget.prototype.destroy.apply(this, arguments);
            this.sourceSelect.css("display", this.initialDisplay);
            this.sourceSelect.prop("multiple", this.initialMultiple);
            this.controlWrapper.unbind().remove();
            this.dropWrapper.remove();
        }
    });

    $.extend($.ui.dropdownchecklist, {
        defaults: {
            width: null
        , maxDropHeight: null
        , firstItemChecksAll: false
        , closeRadioOnClick: false
        , minWidth: 50
        , positionHow: 'absolute'
        , bgiframe: false
        , explicitClose: null
        }
    });

})(jQuery);